Disorder-induced freezing of dynamical spin fluctuations in underdoped cuprates

Details Disorder-induced freezing of dynamical spin fluctuations in underdoped cuprates Disorder-induced freezing of dynamical spin fluctuations in underdoped cuprates

2010-05-04

arxiv.org/abs/1005.0520v2

Phys. Rev. Lett. 105, 147002 (2010)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.147002

We study the dynamical spin susceptibility of a correlated d-wave superconductor (dSC) in the presence of disorder, using an unrestricted Hartree-Fock approach. This model provides a concrete realization of the notion that disorder slows down spin fluctuations, which eventually "freeze out". The evolution of disorder-induced spectral weight transfer agrees qualitatively with experimental observations on underdoped cuprate superconductors. For sufficiently large disorder concentrations, static spin density wave (SDW) order is created when droplets of magnetism nucleated by impurities overlap. We also study the disordered stripe state coexisting with a dSC and compare its magnetic fluctuation spectrum to that of the disorder-generated SDW phase.

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